Separable attachment plug



Jan. 8 1924. g I L48fl72 H. HUBBEL L v SEPARABLE ATTACHMENT PLUG FiledFeb. 16 1921 INVENTOR BY J ATTOR N EY Patented Jan. 1924..

Marian HARVEY HUBBELL, OF'BRIIDGEPORT, CONNECTICUT.

SEPARABLE ATTACHMENT PLUG.

Application filed February 16, 1921. Serial No. 445,407.

To all whom it may concern:

Be it known that I, HARVEY HUBBEIL, a citizen of the United States,residing at Bridgeport, county of F airfield, State of Connecticut, haveinvented an Improvement in separable Attachment Plugs, of which thefollowing is a specification. This invention relates to separableattachment plugs and has for its principal object to simplify, cheapenand generally improve their construction.

A further object of the invention is to provide, in a separableattachment plug comprising the usual plug base, improved blade contactsand simple, inexpensive means for assembling the improved parts in the bse without screws or rivets. In plugs of t is type as heretoforeconstructed, each of the blade contacts has been formed of a pair ofspring plates held together by rivets or screws, and thecontacts havebeen secured in place in the plug base by screws and nuts or similarmeans. In the present invention the spring plates, which may be madefrom.

strip stock to save the waste of material .occurring from blanking, areassembled loosely in the plug base, i. e, without first riveting themtogether. The ordinary screw shell is then screwed on the base, which isadapted to engage the ends of'thev plates of one of the contacts andhold them in assembled relation, the ends of the plates of the othercontact being laced over an eyelet carried in the end 0 the base, whichis then headed over outside the plates to hold them together and toafford the usual center contact for the plug.

With these and other objects in view, I have devised the simple andnovel attachment plug I will now describe, refer-.- ring to theaccompanying drawing forming a part of this specification, and usinreference characters to indicate the severa parts.

Fig. 1 is a view in elevation of my novel plug, showing a blade capattached thereto;

Figs. 2, a bottom plan view of the plug;

Fig. 3, a top plan view thereof;

Fig. 4, a longitudinal section, on an enlarged scale, on the line 14 inFig.2; and

Fig. 5 is a disassembled View of the various parts of my novel plug,shown in perspective and in their sequence of assembly.

1O denotes a plug base of ordinary design and construction, and'll ablade cap having blades thereon, not shown, adapted to enter apertures12formed in one end of the base and engage the blade contacts. The basehas an external thread molded thereon which receives a screw shell 13 inthe usual 14 and 15 denote the blade contacts which lie in chambers 16in the base, 14 indicating the contact to be connected to the screwshell and 15 the contact to be connected to an eyelet 17 centrallylocated in the end of the base. The blade contacts each comprise springplates. 18 having facing U-shaped bends 19 formed at one end to presentspring surfaces for engaging the blades of the cap, and having theirother ends bent at an angle and parallel to form attaching flanges 20.It has been the custom to secure the plates of each contact together byrivets and to fix the contacts in place in the base by screws and nuts.The parts of the plug of this invention are so constructed as to do awaywith all riveting.

The eyelet 17 is centrally located in one attaching flanges of thespring plates of the contact 15 there are formedalined holes 21 whichreceive the protruding end of the eyelet when the contact'is placed inthe base.-

The eyelet may be spun over outside the flanges, which secures thecontact in place and also provides an eflicient center contact 'for asocket (not shown). A contact washer 22-may be placed outside theflanges and spun over on the washer, as shown in Fig. 4. It has beenfound practicable to make the washer convexoconcave and to make theeyelet of such length that when spun over it will overlie only the.,inner portion ofthe washer and not extend to the face thereof, thusleaving the smooth surface of the wash-'- er to form the center contact.

Blade contact 14, as has been described,

.also comprises a pair of spring plates hav- 'over the end of the eyeletand the eyelet ed therein, their outer surface will be flush with thesurface of the tie plate. In assembling the contact 14, the springplates are placed together, the ends of the flanges inserted in the slot24, and the flanges brought to lie in the depression, as willbe apparentfrom an inspection of Fig. 4. At the thread ed end of the base is arecess 26 in which the tie plate is seated, the plate lying flush withthe end of the base, the outer edge of the tie plate being rounded offto conform to the curvature of the base. After the tie plate has beenlocated on the attaching flanges of the spring plates, the contact ispushed into the chamber 16 until the tie plate is seated in recess 26.The screw shell is then turned onto the base, and the usual overlyingflange 27 on the shell then bears against the tie plate and the outerattaching flange seated in the tie plate, thus rej taining the partsinassembled relation and preventing them from being removed from the base.To permanently lock the shell, the

blade contact 14 and the tie plate to thebase, an indentation, as at28,- maybe punched from the flange 27 ofthe shell into apertures 29formed in the attaching flanges and in the tie plate.

It will be obvious that I have provided an improved attachment plugwhich is much cheaper to manufacture andwhich is more easily assembledthan plugs of previous construction. The contact plates of thisinvention are simple in construction and may be cut from strip stock ofthe'desired width, which featurealone involves'a considerable saving ofmaterial as compared with the old types of contact plates which havebeen necessarily blanked out from sheet stock to provide the ordinaryattaching means at the end of the plates. It will be noted that inassembling the improved plug there is no machine work or rivetingrequired to hold the parts together except spinning over the eyelet andindenting the shell.

Having thus described my invention, I claim:

1. In an attachment plug, a blade receiving contact comprising a pair ofspring plates, attaching flanges on said plates, and a tie plate havinga slot to receive the spring plates and a depression which receives saidflanges in superimposed relation and keeps their outer'surface flushwith the surface of the tie plate.

2. In an attachment plug, a base, a blade receiving contact comprising apair .of spring plates having attaching flanges, a tie plate having aslot through which the flanges are passed, a depression at one side ofthe slot in which the flanges are seated, and meansfor attaching saidparts to the base. 7

3. An attachment plug comprising a base, a screw shell having threadedengagement with the base and provided with a flange, a

blade receiving contact comprising a pairv of spring plates havingoverlying slotted attaching flanges, a tie plate having a slot throughwhich the flanges are passed, a depression at one side of the slot inwhich the flanges are seated, and an aperture, the shell,

contact and tie plate being locked in place on the base by anindentation struck from the flange of the shell into the slots in theattaching flanges and the aperture in'the tie plate.

4. An attachment plug comprising a base, a screw shell having threadedengagement with the base and provided with a flange, a blade receivingcontact comprising spring plates havingattaching flanges, and a tieplate having a slot through which the v flanges are passed and adepression at one side of the slot in which the flanges are seated, saidparts being retained in place by the flange on the screw shell.

In testimony whereof I affix my signature.

HARVEY HUBBELL.

